Renal tubular handling of phosphate in the newborn infant
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In a study of 24 newborn infants G.F.R. estimations showed clearances of 7 ml/min/m2 in first few days and 19 ml/min/m2 towards end of first week. Tubular reabsorption of phosphates was high, similar to that found in hypoparathyroidism. Creatinine in urine was calculated by the alkaline piciate method of Bonsnes and Tanskey 1945 and an adoption of this method for creatinine in blood (Brod and Smith 1948). The phosphate in urine and blood was calculated by the method of Fisk and Subbarow.
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